Lalus, Herry. 2020. “A QUADRATIC-QUARTIC-QUINTIC (QQQ) PERTURBATION ON HARMONIC OSCILLATOR: HAMILTONIAN MATRIX REPRESENTATION”. Jurnal Fisika : Fisika Sains Dan Aplikasinya 5 (2), 139-44. https://ejurnal.undana.ac.id/index.php/FISA/article/view/3471.